import argparse
import datetime
import shutil
import sys
from dataclasses import dataclass
from pathlib import Path
from typing import Any
from typing import Dict
from typing import NamedTuple
from typing import Optional
from typing import Sequence
from typing import Union

import jinja2
import marshmallow as msh
import ruamel.yaml


yaml = ruamel.yaml.YAML(typ="safe")


@dataclass
class MediaContainer:
    title: str
    source: str
    preview: Optional[str] = None
    anchor: Optional[Union[str, int]] = None
    content: Optional[str] = None
    hide_source: bool = False


class MediaSerializer(msh.Schema):
    title = msh.fields.String(required=True)
    source = msh.fields.String(required=True)
    preview = msh.fields.String(required=False)
    anchor = msh.fields.String(required=False)
    content = msh.fields.String(required=False)
    hide_source = msh.fields.Boolean(required=False)

    @msh.post_load
    def _make_dataclass(self, data: Dict[str, Any], *args, **kwargs) -> MediaContainer:
        return MediaContainer(**data)


@dataclass
class LinkContainer:
    link: str
    title: Optional[str] = None
    icon: Optional[str] = None


class LinkSerializer(msh.Schema):
    link = msh.fields.URL(required=True)
    title = msh.fields.String(required=False)
    icon = msh.fields.String(required=False)

    @msh.post_load
    def _make_dataclass(self, data: Dict[str, Any], *args, **kwargs) -> LinkContainer:
        return LinkContainer(**data)


class Location(NamedTuple):
    title: str
    link: str


class LocationSeralizer(msh.Schema):
    title = msh.fields.String(required=True)
    link = msh.fields.URL(required=True)

    @msh.post_load
    def _make_dataclass(self, data: Dict[str, Any], *args, **kwargs) -> Location:
        return Location(**data)


@dataclass
class PostContainer:
    title: str
    location: Location
    date: datetime.date
    banner: str
    media: Sequence[MediaContainer]
    links: Sequence[LinkContainer] = ()
    slug: Optional[str] = None


class PostSerializer(msh.Schema):

    title = msh.fields.String(required=True)
    location = msh.fields.Nested(LocationSeralizer, required=True)
    date = msh.fields.Date("%Y-%m-%d", required=True)
    banner = msh.fields.URL(required=True)
    slug = msh.fields.String(required=False)
    links = msh.fields.List(msh.fields.Nested(LinkSerializer), required=False)
    media = msh.fields.List(msh.fields.Nested(MediaSerializer), required=True)

    @msh.validates_schema
    def _unique_anchors(self, data: Dict[str, Any], **kwargs):
        anchors = [item.anchor for item in data["media"] if item.anchor is not None]
        if len(anchors) != len(set(anchors)):
            raise msh.ValidationError(
                f"Media anchors used multiple times: {set([item for item in anchors if anchors.count(item) > 1])}"
            )

    @msh.post_load
    def _make_dataclass(self, data: Dict[str, Any], *args, **kwargs) -> PostContainer:
        for index, item in enumerate(data["media"]):
            item.anchor = item.anchor or index
            data["media"][index] = item
        return PostContainer(**data)


class ConfigSerializer(msh.Schema):
    static = msh.fields.List(msh.fields.String(), required=False)
    posts = msh.fields.List(msh.fields.Nested(PostSerializer), required=True)

    @msh.validates_schema
    def _unique_slugs(self, data: Dict[str, Any], **kwargs):
        slugs = [item.slug for item in data["posts"] if item.slug is not None]
        if len(slugs) != len(set(slugs)):
            raise msh.ValidationError(
                f"Post slugs used multiple times: {set([item for item in slugs if slugs.count(item) > 1])}"
            )


def get_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--config", help="Path to the config file", default=(Path.cwd() / "config.yaml")
    )
    parser.add_argument(
        "-c", "--check", action="store_true", help="Check the config without building"
    )
    return parser.parse_args()


def main():
    args = get_args()

    cwd = Path.cwd().resolve()
    output = cwd / "build"
    explore = output / "explore"

    with Path(args.config).resolve().open() as infile:
        config = ConfigSerializer().load(yaml.load(infile))

    if args.check:
        return 0

    env = jinja2.Environment(
        loader=jinja2.FileSystemLoader(str(cwd / "templates")),
        autoescape=jinja2.select_autoescape(["html", "xml"]),
    )

    output.mkdir(exist_ok=True)
    explore.mkdir(exist_ok=True)

    index = env.get_template("index.html.j2").render(config=config)
    with (explore / "index.html").open("w") as outfile:
        outfile.write(index)

    sitemap = env.get_template("sitemap.xml.j2").render(config=config)
    with (output / "sitemap.xml").open("w") as outfile:
        outfile.write(sitemap)

    for static in config["static"]:
        dest = Path(output / static).resolve()
        dest.parent.mkdir(parents=True, exist_ok=True)
        shutil.copyfile(static, str(output / static), follow_symlinks=True)

    post_template = env.get_template("post.html.j2")
    for post_data in config["posts"]:
        post = post_template.render(post=post_data)
        with (explore / f"{post_data.slug}.html").open("w") as outfile:
            outfile.write(post)

    nginx = env.get_template("nginx.conf.d.j2").render(config=config)
    with (cwd / "nginx.conf").open("w") as outfile:
        outfile.write(nginx)


if __name__ == "__main__":
    sys.exit(main())